Arctic Skua vs Mottled Petrel

In short

The Arctic Skua (Stercorarius parasiticus) and Mottled Petrel (Pterodroma inexpectata) are distinct in both appearance and behavior. The Arctic Skua is a kleptoparasitic seabird with variable plumage morphs, while the Mottled Petrel is a pelagic species with a more uniform mottled appearance. These species are not closely related, belonging to different families.

Identification tips

1. Tail Shape: Arctic Skua has elongated central tail feathers, especially noticeable in adults, while Mottled Petrel has a more typical petrel tail shape. 2. Flight Pattern: Arctic Skua exhibits agile, often aggressive flight patterns, while Mottled Petrel has a more graceful, gliding flight. 3. Plumage Variability: Be cautious of the Arctic Skua's variable plumage; focus on structure and behavior. 4. Habitat: Consider the habitat; Arctic Skua is more likely near coasts, while Mottled Petrel is found over open ocean.

Size

Arctic Skua is generally larger and more robust than the Mottled Petrel, with a heavier build.

Plumage

Arctic Skua exhibits two contrasting morphs, dark and light, with intermediate forms, whereas Mottled Petrel has a consistent mottled gray and white plumage. Arctic Skua's plumage can vary significantly, making it challenging to identify by color alone.

Behaviour

Arctic Skua is known for its kleptoparasitic behavior, often chasing other seabirds to steal their food. In contrast, Mottled Petrel is typically seen gliding over open ocean waters, feeding on its own.

Habitat

Arctic Skua breeds in the Arctic and sub-Arctic regions and is often seen near coastal areas during migration. Mottled Petrel is a pelagic species, spending most of its life over open oceans and breeding on remote islands.